Bedienungsanleitung Roland XV-2020 (Seite 52 von 169) (Englisch)

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Creating a Patch

Tips for Choosing a Waveform

Because the XV-2020 is designed to create highly realistic sounds, the success of the editing process

depends to a large degree on the PCM waveforms upon which Tones are based. Therefore, if you try to

create a sound that’s totally different from the waveform(s) you’re working with, the desired result may

be difficult or impossible to achieve.

The XV-2020’s internal waveforms fall into the following two groups.

• One-shot:These waveforms contain sounds that have short decays. A one-shot waveform records the

initial rise and fall of its sound. Some of the XV-2020’s one-shot waveforms are sounds that are

complete in themselves, such as percussive instrument sounds. The XV-2020 also contains

many other one-shot waveforms that are elements of other sounds. These include attack

components such as piano-hammer sounds and guitar fret noises.

• Looped: These waveforms include sounds with long decays as well as sustained sounds. With looped

waveforms, the latter part of the sound plays over and over for as long as the note is held,

allowing wave memory to be used more efficiently. The XV-2020’s looped waveforms also

include components of other sounds, such as piano-string resonant vibrations and the hollow

overtones of brass instruments.

The following diagram shows an example of a sound—an electric organ—that combines one-shot and

looped waveforms.

fig.1-09.e

Notes for editing one-shot waveforms

You cannot give a one-shot waveform a longer decay—or make it into a sustaining sound—by using an

envelope. If you were to program such an envelope, you would be attempting to shape a portion of the

sound that simply doesn’t exist, and the envelope would have no effect.

Notes for editing looped waveforms

With many acoustic instruments such as piano and sax, extreme timbral changes occur during the first few

moments of each note. This initial attack is what defines much of the instrument’s character. The XV-2020

provides a variety of waveforms containing realistic acoustic instrument attacks. To obtain the maximum

realism when using these waveforms, it’s best to leave the filter wide-open during the attack so that all of

these important timbral changes are heard. If you use an envelope to modify the attack portion, you may not

achieve the result you want. Use enveloping to produce the desired changes in the decay portion of the sound.

fig.1-10.e

If you try to make a waveform’s attack seem brighter by lowering the high-frequency content of its decay

using the TVF filter, consider the original timbral character of the waveform. If you’re making a part of the

sound brighter than the original waveform, you should first generate new upper harmonics not present in

the original waveform by using the Wave FXM Color and Wave FXM Depth parameters before filtering.

This will help you achieve the desired result. To make an entire waveform brighter, try applying an effect

such as an enhancer and equalizer before modifying the TVF parameter.

TVA ENV for looped Organ

waveform (sustain portion)

Key-off

Resulting TVA ENV change

TVA ENV for one-shot Key-

click waveform (attack portion)

Key-off

Tone change stored

with the wave

Envelope

for the TVF filter

Resulting tone change

Looped Portion

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Roland XV-2020 Seite 52

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